Yes, you should not put zero as the cost basis for your RSUs. It appears that your Supplemental Information is the more accurate document and thus, that is the form you should rely upon when entering the cost basis into TurboTax. If you were to leave your cost basis at zero, you will likely pay a lot more in tax than is required. Although, it may also be prudent to double-check what you see on the Supplemental Information. If you know the date the RSUs vested with you, then you can use a third party financial website, such as Yahoo Finance, to check the prices on the Supplemental Information.
If you are using TurboTax online, there is the box The cost basis is incorrect or missing on my 1099-B. Checking that box which will trigger TurboTax to give you the option to enter your adjustment to cost basis. To enter your RSUs into TurboTax online, follow these steps:
- Log into your account
- Select Income & Expenses
- Scroll down the page to Investment Income
- Select Stocks, Cryptocurrency, Mutual Funds...etc
- Respond to the questions.
Here is a TurboTax article that addresses RSUs: How to Report RSUs on Your Tax Return
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